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+## Copyright (C) 2007 Kai Habel
+##
+## This program is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2, or (at your option)
+## any later version.
+##
+## OctPlot is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with OctPlot; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File}  spinmap (@var{T}, @var{inc})
+## @deftypefnx {Function File}  spinmap (@var{T})
+## @deftypefnx {Function File}  spinmap ()
+## Cycles the colormap for @var{T} seconds with an increment
+## of @var{inc}. Both parameter are optional. In that case 5s and an increment 
+## of 2 is taken.
+## A higher @var{inc} causes a faster cycle through the colormap.
+## @end deftypefn
+## @seealso{gca, colorbar}
+
+## Author: Kai Habel <kai.habel at gmx.de>
+
+function spinmap(T, inc)
+
+  if (nargin == 0)
+    inc = 2;
+    T = 5;
+  elseif (nargin == 1)
+    inc = 2;
+  endif
+
+  cmap = get(gcf,"Colormap");
+  clen = rows(cmap);
+
+  t0 = clock;
+
+  while (etime(clock, t0) < T)
+    for n = 1 : inc : clen
+      newmap = shift(cmap, n, 1);
+      set(gcf,"Colormap",newmap)
+      drawnow
+    endfor
+  end
+  set(gcf,"Colormap",cmap)
+end